Sounds like your fish is still infected. Maybe not a complete kill on the parasites. Most of the lifers here say that the metro component of general cure is not strong/pure enough to adequately deal with internal parasites in discus.
Buy metro from jehmco. I believe the dosing is 500mg/10gal daily i think for 10 days, with a big water change b4 each new dose. Hopefully someone with more experience can conform the number of days...